proper execution of the integration tests

Author: ZeeCoder

.travis.yml

@@ -7,8 +7,8 @@ script:
   - lerna bootstrap --ignore={demos}
   - yarn test:unit
   - lerna run test
-  - node ./tests/bin/is-first-ci-job.js && yarn test:integration:build || echo
-  - node ./tests/bin/is-first-ci-job.js && yarn test:integration || echo
+  - node ./tests/bin/run-on-first-ci-job.js && yarn test:integration:build
+  - node ./tests/bin/run-on-first-ci-job.js && yarn test:integration
 after_success: "yarn coveralls"
 cache:
   yarn: true

tests/bin/is-first-ci-job.js

@@ -0,0 +1,21 @@
+const ciJobNumber = require("ci-job-number");
+const { spawn } = require("child_process");
+
+if (ciJobNumber() !== 1) {
+  // If it's not the first job, then just return with a success code.
+  process.exit(0);
+}
+
+// Run the command otherwise.
+const command = process.argv[2];
+const args = process.argv.slice(3);
+
+const execution = spawn(command, args);
+
+execution.stdout.on("data", data => {
+  process.stdout.write(data.toString());
+});
+
+execution.stderr.on("data", data => {
+  console.error(data.toString());
+});